//  Capture.swift
//  GreenshotMac
//
//  Equivalent of Greenshot's ICapture / ICaptureDetails.

import AppKit

enum CaptureMode: String {
    case region
    case fullscreen
    case window
    case lastRegion
    case importedFile
}

/// Metadata that travels with a capture; used by the filename pattern engine.
struct CaptureDetails {
    var captureMode: CaptureMode = .region
    var dateTime: Date = Date()
    /// Title of the captured window, or the screen name for a full screen capture.
    var title: String = ""
    /// Bundle identifier of the captured application, when known.
    var applicationBundleID: String?
    /// Application name of the captured window, when known.
    var applicationName: String?
    /// Screen rectangle the capture was taken from, in global (top-left origin) coordinates.
    var screenBounds: CGRect = .zero
    /// Scale factor of the display the capture came from.
    var scaleFactor: CGFloat = 2.0
    /// Set once the capture has been written to disk.
    var filePath: String?
}

/// A screenshot plus its metadata.
final class Capture {
    var image: CGImage
    var details: CaptureDetails

    init(image: CGImage, details: CaptureDetails) {
        self.image = image
        self.details = details
    }

    var pixelSize: CGSize {
        CGSize(width: image.width, height: image.height)
    }

    /// Size in points, i.e. pixels divided by the capture's backing scale factor.
    var pointSize: CGSize {
        CGSize(width: CGFloat(image.width) / details.scaleFactor,
               height: CGFloat(image.height) / details.scaleFactor)
    }

    var nsImage: NSImage {
        NSImage(cgImage: image, size: pointSize)
    }
}

enum CaptureError: LocalizedError {
    case permissionDenied
    case noContent
    case cancelled
    case captureFailed(String)

    var errorDescription: String? {
        switch self {
        case .permissionDenied:
            return "GreenshotMac needs Screen Recording permission. Open System Settings › Privacy & Security › Screen Recording and enable GreenshotMac."
        case .noContent:
            return "Nothing was available to capture."
        case .cancelled:
            return "Capture cancelled."
        case .captureFailed(let message):
            return message
        }
    }
}